<p>
  <mat-toolbar color="primary">
    <button mat-icon-button id="menu-icon" aria-label="基于人脸识别的监控安防系统">
      <mat-icon>adb</mat-icon>
    </button>
    <span>基于人脸识别的监控安防系统</span>
    <span class="example-spacer"></span>
    <button mat-button id="monitor-icon" aria-label="监控" (click)="gotoIndex('')">
      <mat-icon>airplay</mat-icon>
    </button>
    <button mat-button id="add-icon" aria-label="添加人脸" (click)="gotoRegister('')">
      <mat-icon>add</mat-icon>
    </button>
    <button mat-button id="logs-icon" aria-label="日志" (click)="gotoLog('')">
      <mat-icon>notes</mat-icon>
    </button>
  </mat-toolbar>
</p>

